From: Guillaume Nault <gnault@redhat.com>
To: Dan Carpenter <error27@gmail.com>
Cc: oe-kbuild@lists.linux.dev, Cong Wang <cong.wang@bytedance.com>,
lkp@intel.com, oe-kbuild-all@lists.linux.dev,
linux-kernel@vger.kernel.org
Subject: Re: net/l2tp/l2tp_core.c:1481 l2tp_tunnel_register() warn: missing error code 'ret'
Date: Mon, 13 Feb 2023 12:15:35 +0100 [thread overview]
Message-ID: <Y+ob1xnM09kMlbRp@debian> (raw)
In-Reply-To: <Y+nLBPj70/03q8Do@kadam>
On Mon, Feb 13, 2023 at 08:30:44AM +0300, Dan Carpenter wrote:
> On Fri, Feb 03, 2023 at 01:21:48PM +0100, Guillaume Nault wrote:
> > On Fri, Feb 03, 2023 at 11:56:01AM +0300, Dan Carpenter wrote:
> > > tree: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
> > > head: 66a87fff1a87c260452f5a57123891ca5258c449
> > > commit: c4d48a58f32c5972174a1d01c33b296fe378cce0 l2tp: convert l2tp_tunnel_list to idr
> > > config: powerpc-randconfig-m031-20230202 (https://download.01.org/0day-ci/archive/20230203/202302031144.yY6UaRcD-lkp@intel.com/config)
> > > compiler: powerpc-linux-gcc (GCC) 12.1.0
> > >
> > > If you fix the issue, kindly add following tag where applicable
> > > | Reported-by: kernel test robot <lkp@intel.com>
> > > | Reported-by: Dan Carpenter <error27@gmail.com>
> > >
> > > smatch warnings:
> > > net/l2tp/l2tp_core.c:1481 l2tp_tunnel_register() warn: missing error code 'ret'
> > >
> > > vim +/ret +1481 net/l2tp/l2tp_core.c
> > >
> > > 6b9f34239b00e6 Guillaume Nault 2018-04-10 1456 int l2tp_tunnel_register(struct l2tp_tunnel *tunnel, struct net *net,
> > > 6b9f34239b00e6 Guillaume Nault 2018-04-10 1457 struct l2tp_tunnel_cfg *cfg)
> > > 6b9f34239b00e6 Guillaume Nault 2018-04-10 1458 {
> > > c4d48a58f32c59 Cong Wang 2023-01-13 1459 struct l2tp_net *pn = l2tp_pernet(net);
> > > c4d48a58f32c59 Cong Wang 2023-01-13 1460 u32 tunnel_id = tunnel->tunnel_id;
> > > 6b9f34239b00e6 Guillaume Nault 2018-04-10 1461 struct socket *sock;
> > > 6b9f34239b00e6 Guillaume Nault 2018-04-10 1462 struct sock *sk;
> > > 6b9f34239b00e6 Guillaume Nault 2018-04-10 1463 int ret;
> > > 6b9f34239b00e6 Guillaume Nault 2018-04-10 1464
> > > c4d48a58f32c59 Cong Wang 2023-01-13 1465 spin_lock_bh(&pn->l2tp_tunnel_idr_lock);
> > > c4d48a58f32c59 Cong Wang 2023-01-13 1466 ret = idr_alloc_u32(&pn->l2tp_tunnel_idr, NULL, &tunnel_id, tunnel_id,
> > > c4d48a58f32c59 Cong Wang 2023-01-13 1467 GFP_ATOMIC);
> > > c4d48a58f32c59 Cong Wang 2023-01-13 1468 spin_unlock_bh(&pn->l2tp_tunnel_idr_lock);
> > > c4d48a58f32c59 Cong Wang 2023-01-13 1469 if (ret)
> > > c4d48a58f32c59 Cong Wang 2023-01-13 1470 return ret == -ENOSPC ? -EEXIST : ret;
> > > c4d48a58f32c59 Cong Wang 2023-01-13 1471
> > > 6b9f34239b00e6 Guillaume Nault 2018-04-10 1472 if (tunnel->fd < 0) {
> > > 6b9f34239b00e6 Guillaume Nault 2018-04-10 1473 ret = l2tp_tunnel_sock_create(net, tunnel->tunnel_id,
> > > 6b9f34239b00e6 Guillaume Nault 2018-04-10 1474 tunnel->peer_tunnel_id, cfg,
> > > 6b9f34239b00e6 Guillaume Nault 2018-04-10 1475 &sock);
> > > 6b9f34239b00e6 Guillaume Nault 2018-04-10 1476 if (ret < 0)
> > > 6b9f34239b00e6 Guillaume Nault 2018-04-10 1477 goto err;
> > > 6b9f34239b00e6 Guillaume Nault 2018-04-10 1478 } else {
> > > 6b9f34239b00e6 Guillaume Nault 2018-04-10 1479 sock = sockfd_lookup(tunnel->fd, &ret);
> > > 6b9f34239b00e6 Guillaume Nault 2018-04-10 1480 if (!sock)
> > > 6b9f34239b00e6 Guillaume Nault 2018-04-10 @1481 goto err;
> > > ^^^^^^^^^
> > > I don't know why this is showing up as a 3 week old warning when it
> > > looks like the code is from 2018... Anyway, should this be an error
> > > path or a success path?
> >
> > This is an error path.
> > But I don't understand this warning. Does it complain that 'ret' isn't
> > initialised before the 'goto err;' jump? (this is done by
> > sockfd_lookup() in case of error).
>
> Or sorry, I didn't see the &ret.
No problem.
> Yes, Smatch thinks "ret" is zero here.
> The kbuild-bot can't use the cross function database (building the DB
> is too slow to scale). So that's why the warning is printed.
Okay, thanks for the explanations.
> regards,
> dan carpenter
>
prev parent reply other threads:[~2023-02-13 11:17 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2023-02-03 8:56 net/l2tp/l2tp_core.c:1481 l2tp_tunnel_register() warn: missing error code 'ret' Dan Carpenter
2023-02-03 12:21 ` Guillaume Nault
2023-02-13 5:30 ` Dan Carpenter
2023-02-13 11:15 ` Guillaume Nault [this message]
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